I see that ehci-hcd.c has a warning in when either the UHCI or OHCI
driver is loaded before the EHCI driver:
set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
" before uhci_hcd and ohci_hcd, not after\n");
What actually prevents the UHCI or OHCI driver from being loaded before
the EHCI driver? Is it left up to userspace?
Since PCI devices can be initialized in parallel, even if the EHCI
driver is loaded first, that doesn't guarantee that the PCI probe for
the EHCI controller actually finishes before the UHCI/OHCI PCI probe,
right?
Sarah Sharp
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